One Direction's bright-eyed Irish crooner is sporting quite an impressive celebrity selfie collection online. Niall Horan has rubbed faces with everyone from Katy Perry to Will Ferrell.
For his latest selfie show-off, Horan posed cheek-to-cheek with fellow musician John Mayer. The "Who You Love" singer was finishing up a stop at London's O2 arena, only a day after One Direction finished their very memorable Wembley Stadium performances.
Take a stroll through the rest of Niall's celeb stockpile:
Soccer Star Lionel Messi
5 Seconds Of Summer's Luke Hemmings
5 Seconds Of Summer's Ashton Irwin
Rolling Stones' Ronnie Wood
Train's Pat Monahan
High five, Niall! Keep it coming with the rock legends.